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3 (a) Figure 5 shows two potato chips - Edexcel - GCSE Biology - Question 3 - 2018 - Paper 1
Question 3
3 (a) Figure 5 shows two potato chips. chip A chip B
Worked Solution & Example Answer:3 (a) Figure 5 shows two potato chips - Edexcel - GCSE Biology - Question 3 - 2018 - Paper 1
Step 1
3(a)(i) Calculate the volume of each chip.
Answer
To calculate the volume of the potato chips, we can use the formula for the volume of a rectangular prism:
For chip A:
- Length (X) = 2.5
- Width (Y) = 2.0
- Height (Z) = 5.0
Volume of chip A:
For chip B:
- Length (X) = 2.0
- Width (Z) = 2.0
- Height (Y) = 4.0
Volume of chip B:
Total Volume:
Thus, the total volume of both chips is 41.0.
Step 2
Step 3
3(a)(iii) Explain the effects of water concentration on the potato chips.
Answer
When the cells of the potato chips are exposed to a solution with a higher water concentration, the following occurs:
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The cells lose water and become plasmolyzed due to water moving out by osmosis. This happens from a region of high water concentration (inside the potato) to a region of low water concentration (the external solution).
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Consequently, the cells shrink or lose mass as they lose water molecules.
Step 4
3(b) Explain why potato cells do not photosynthesize.
Answer
Potato cells do not contain chloroplasts, which are essential for photosynthesis. Furthermore, in the absence of light, potato cells cannot perform photosynthesis, and thus they cannot produce their own energy through this process. Instead, they might have more amyloplasts for starch storage.